On the plasma sheet dependence on solar wind and substorms and its role in magnetosphere-ionosphere coupling
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- 作者：V A Sergeev ; N P Dmitrieva ; N A Stepanov ; D A Sormakov…
- 关键词：Plasma sheet ; Particle acceleration ; Solar wind driver ; Substorms ; Flow burst
- 刊名：Earth, Planets and Space
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：67
- 期：1
- 全文大小：1353KB
- 参考文献：Artemyev AV, Baumjohann W, Petrukovich AA, Nakamura R, Dandouras I, Fazakerley A (2011) Proton/electron temperature ratio in the magnetotail. Ann Geophys 29(12):2253-257. doi:10.-194/?angeo-29-2253-2011 CrossRef
Baumjohann W (1993) The near-Earth plasma sheet: an AMPTE/IRM perspective. Space Sci Rev 64(1-):141-63. doi:10.-007/?BF00819660 CrossRef
Borovsky JE, Thomsen MF, Elphic RC, Cayton TE, McComas DJ (1998) The transport of plasma sheet material from the distant tail to geosynchronous orbit. J Geophys Res 103(A9):20297-0331CrossRef
Fukushima N (1976) Generalized theorem for no ground magnetic effect of vertical currents connected with Pedersen currents in the uniform-conductivity ionosphere. Rep Ionos Space Res Jap 30:35-0
Gabrielse C, Angelopoulos V, Runov A, Turner DL (2014), Statistical characteristics of particle injections throughout the equatorial magnetotail, J. Geophys. Res. Space Physics, 119, 2512-535. doi:10.-002/-013JA019638 .
Knight S (1973) Parallel electric fields. Planet Space Sci 21:741-50CrossRef
Korth H, Zhang Y, Anderson BJ, Sotirelis T, Waters CL (2014) Statistical relationship between large-scale upward field-aligned currents and electron precipitation. J Geophys Res Space Physics 119:6715-731. doi:10.-002/-014JA019961 CrossRef
Luo B, Tu W, Li X, Gong J, Liu S, Burin Des Roziers E, Baker DN (2011) On energetic electrons (>38 keV) in the central plasma sheet: data analysis and modeling. J Geophys Res 116:A09220. doi:10.-029/-011JA016562
Newell PT, Gjerloev JW (2011) Evaluation of SuperMAG auroral electrojet indices as indicators of substorms and auroral power. J Geophys Res 116:A12211. doi:10.-029/-011JA016779 CrossRef
Ostgaard N, Vondrak RR, Gjerloev JW, Germany G (2002) A relation between the energy deposition by electron precipitation and geomagnetic indices during substorms. J Geophys Res 107(A9):1246. doi:10.-029/-001JA002003 CrossRef
Paschmann G, Haaland S, Treumann R (eds) (2003) Auroral Plasma Physics, Space Sci. Series of ISSI, vol 15. Kluwer Acad. Publ, Dordrecht, Also Space Sci. Revs, 103, N1-4, 2002
Runov A., V. Angelopoulos, C.Gabrielse, J. Liu, D.L. Turner, X.-Z. Zhou (2015), Average thermodynamic and spectral properties of plasma in and around dipolarizing flux bundles, J.Geophys.Res., 120, N6, 4369-383. doi:10.-002/-015JA021166
Sergeev, V. A., D. A. Sormakov, V. Angelopoulos (2014) A missing variable in solar wind-magnetosphere-ionosphere coupling studies. Geophys. Res. Lett. 41. doi:10.-002/-014GL062271
Tsyganenko NA and Mukai T (2003), Tail plasma sheet models derived from Geotail particle data, J. Geophys. Res., 108(A3), 1136. doi:10.-029/-002JA009707 CrossRef
Terasawa T et al (1997) Solar wind control of density and temperature in the near-Earth plasma sheet: WIND/GEOTAIL collaboration. Geophys Res Lett 24:935-38. doi:10.-029/-6GL04018 CrossRef
Wang C-P, Lyons LR, Nagai T, Weygand JM, Lui ATY (2010) Evolution of plasma sheet particle content under different inter-planetary magnetic field conditions. J Geophys Res 115:A06210. doi:10.-029/-009JA015028
Wang C-P, Gkioulidou M, Lyons LR, Angelopoulos V (2012) Spatial distributions of the ion to electron temperature ratio in the magnetosheath and plasma sheet. J Geophys Res 117:A08215. doi:10.-029/-012JA017658 - 作者单位：V A Sergeev (1)
N P Dmitrieva (1)
N A Stepanov (1) (2)
D A Sormakov (2)
V Angelopoulos (3)
A V Runov (3)
1. Earth Physics Department, St. Petersburg State University, Ulyanovskaya 1, Petrodvoretz, St. Petersburg, 198504, Russia
2. Arctic and Antarctic Research Institute, St. Petersburg, Russia
3. University of California, Los Angeles, CA, USA - 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 出版者：Springer Berlin Heidelberg
- ISSN：1880-5981
文摘
Recently, it was argued that Hall conductivity and peak intensity of equivalent ionospheric currents are sensitive to the amount of field-aligned acceleration of plasma sheet (PS) electrons, which in turn depends on the plasma sheet parameters T e and N e (electron temperature and density) proportionally to the quantity eTN--T e)1/2/N e. Here we extend these studies using data from six tail seasons of THEMIS observations to show statistically that the behavior of these PS electron parameters, measured in the middle of the nightside plasma sheet at ~10?RE distance, depends in a very different way on two basic processes: the solar wind state and substorms. We confirm previous work that slow/dense (fast/tenuous) solar wind provides cold/dense (hot/tenuous) plasma sheet conditions. However, we find that electron temperature and pressure parameters (T e and P e) behave differently from the proton ones (T p and P p), indicating a strong decoupling between temperature variations of auroral protons and electrons in the central plasma sheet (CPS): electrons are more sensitive to the substorm-related acceleration in the magnetotail than protons. Our superposed epoch study of plasma sheet parameter variations during substorms as well as our analysis of plasma acceleration at dipolarization fronts shows that during the substorm expansion phase a new (accelerated and plasma-depleted) population comes into the inner CPS with the flow bursts, showing an average increase of electron temperature and eTN parameter roughly by a factor of 2 above its background values for both cold/dense and hot/tenuous plasma sheet states. Preferential electron heating in the flow bursts is also statistically confirmed. Keywords Plasma sheet Particle acceleration Solar wind driver Substorms Flow burst